Buckling of paramagnetic chains in soft gels. Issue 1 (14th October 2015)

• Record Type: Journal Article
• Authors: Huang, Shilin; Pessot, Giorgio; Cremer, Peet; Weeber, Rudolf; Holm, Christian; Nowak, Johannes; Odenbach, Stefan; Menzel, Andreas M.; Auernhammer, Günter K.
• Is Part Of: Soft matter. Volume 12:Issue 1(2016)
• Page Start: 228
• Page End: 237
• Publication Date: 2015-10-14
• Subjects: Soft condensed matter -- Periodicals; 530.413
• DOI: 10.1039/c5sm01814e
• Languages: English
• ISSNs: 1744-683X

Abstract

Abstract : Paramagnetic particle chains in soft polymer gels can show pronounced buckling deformation under perpendicular external magnetic fields. Abstract : We study the magneto-elastic coupling behavior of paramagnetic chains in soft polymer gels exposed to external magnetic fields. To this end, a laser scanning confocal microscope is used to observe the morphology of the paramagnetic chains together with the deformation field of the surrounding gel network. The paramagnetic chains in soft polymer gels show rich morphological shape changes under oblique magnetic fields, in particular a pronounced buckling deformation. The details of the resulting morphological shapes depend on the length of the chain, the strength of the external magnetic field, and the modulus of the gel. Based on the observation that the magnetic chains are strongly coupled to the surrounding polymer network, a simplified model is developed to describe their buckling behavior. A coarse-grained molecular dynamics simulation model featuring an increased matrix stiffness on the surfaces of the particles leads to morphologies in agreement with the experimentally observed buckling effects.